Thoroughly enjoyed my stay at Andrew's. The apartment is wonderfully spacious, and indeed very well-appointed. Little touches e.g. detergent for the washing machine, loads of bottled water, and the mini library make it such a comfortable place.
Location is also excellence. Though the place is tucked in amidst a quiet alley, it's only a stone's throw away from Ratchadamri BTS station (Silom line), and you can stroll (<10 min) to Chit Lom BTS station for Sukhumvit line access too. The fact that you're within walking distance to Central World, Siam Paragon, and Platinum are also huge plus points.
Andrew was also a really responsive host who takes care of his guests, even though he's not based in Bangkok. There was a hiccup with the Wifi when I arrived, but Andrew promptly resolved the situation, which was greatly appreciated.
Hope to be back soon!